Proposal for a microwave photon to optical photon converter based on traveling magnons in thin magnetic films

Kostylev, Mikhail; Stashkevich, A.A.

doi:10.1016/j.jmmm.2019.04.013

Cited by 19 publications

(11 citation statements)

References 31 publications

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“…Magnonic systems have been of considerable interest recently. Applications of such systems range from quantum information processing [1][2][3] and coherent conversion of microwave to optical frequency light [4,5], to microwave components in the form of filters, circulators, isolators and oscillators. Additionally, such systems are used in the study of hybrid quantum systems [6,7], Quantum electrodynamics (QED) [8][9][10], and direct detection of dark matter [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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Several experimental implementations of cavity-magnon systems are presented. First an Yttrium Iron Garnet (YIG) block is placed inside a re-entrant cavity where the resulting hybrid mode is measured to be in the ultra strong coupling (USC) regime. When fully hybridised the ratio between the coupling rate and uncoupled mode frequencies is determined to be g/ω=0.46. Next a thin YIG cylinder is placed inside a loop gap cavity. The bright mode of this cavity couples to the YIG sample and is similarly measured to be in the USC regime with ratio of coupling rate to uncoupled mode frequencies as g/ω=0.34. A larger spin density medium such as lithium ferrite (LiFe) is expected to improve couplings by a factor of 1.46 in both systems as coupling strength is shown to be proportional to the square root of spin density and magnetic moment. Such strongly coupled systems are potentially useful for cavity QED, hybrid quantum systems and precision dark matter detection experiments. The YIG disc in the loop gap cavity, is, in particular, shown to be a strong candidate for dark matter detection. Finally, a LiFe sphere inside a two post re-entrant cavity is considered. In past work it was shown that the magnon mode in the sample has a turnover point in frequency (Goryachev et al 2018 Phys. Rev. B 97 155129). Additionally, it was predicted that if the system was engineered such that it fully hybridised at this turnover point the cavity-magnon polariton transition frequency would become insensitive to both first and second order magnetic bias field fluctuations, a result useful for precision frequency applications. This work implements such a system by engineering the cavity mode frequency to near this turnover point, with suppression in sensitivity to second order bias magnetic field fluctuations shown.

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Section: Introductionmentioning

confidence: 99%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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“…Recently, enthusiasm has grown for the study of magnon dynamics at millikelvin (mK) temperatures, the temperature regime in which solid-state microwave quantum systems operate [3][4][5][6][7][8][9][10][11][12]. This work offers the possibility to explore the dynamics of microwave magnons in the quantum regime and to study novel quantum devices with magnonic components [13][14][15].…”

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confidence: 99%

Microwave magnon damping in YIG films at millikelvin temperatures

et al. 2019

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Magnon systems used in quantum devices require low damping if coherence is to be maintained. The ferrimagnetic electrical insulator yttrium iron garnet (YIG) has low magnon damping at room temperature and is a strong candidate to host microwave magnon excitations in future quantum devices. Monocrystalline YIG films are typically grown on gadolinium gallium garnet (GGG) substrates. In this work, comparative experiments made on YIG waveguides with and without GGG substrates indicate that the material plays a significant role in increasing the damping at low temperatures. Measurements reveal that damping due to temperature-peak processes is dominant above 1 K. Damping behaviour that we show can be attributed to coupling to two-level fluctuators (TLFs) is observed below 1 K. Upon saturating the TLFs in the substrate-free YIG at 20 mK, linewidths of ∼ 1.4 MHz are achievable: lower than those measured at room temperature.

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“…The obtained magnon-mediated optical-to-optical conversion efficiency of 5% under realistic conditions is larger than that measured in YIG spheres [6,7], which does not exceed the order of 10 −6 , and also at least one order of magnitude higher than the theoretically estimated efficiencies in lossless planar-waveguide optomagnonic architectures [16]. The performance of our design can be further improved by carefully engineering high-quality-factor optical modes, which requires the selection of low-loss materials, ensuring also an inherently strong magneto-optical coupling.…”

Section: Resultsmentioning

confidence: 52%

“…The method goes beyond phenomenological modeling [6][7][8], and rigorously provides the opticalto-optical conversion efficiency in a straightforward manner since it evaluates the intensity of all (elastically and inelastically) transmitted and reflected light beams associated with all magnon absorption and emission processes. In this respect, contrary to other approaches [10,16], it is not restricted to the linear-response regime and is correct to any order in perturbation theory. The essentials of the time-Floquet scattering-matrix method are summarized below.…”

Section: Theory For Layered Optomagnonic Structuresmentioning

confidence: 89%

“…A promising alternative design of optomagnonic cavities is based on planar geometries, which can exhibit even stronger conversion efficiencies, while at the same time allowing integration into a hybrid opto-microwave chip using modern nanofabrication methods. In a recent work on a planar-waveguide optomagnonic architecture, using a lossless bismuth-substituted yttrium iron garnet (Bi:YIG) film as active material, optical-tooptical conversion efficiencies ranging from 10 −5 to almost 10 −2 (depending on the thickness of the film) were predicted [16]. However, since light is guided inside Bi:YIG, the introduction of realistic dissipative losses would result in significant decrease of the efficiency.…”

Section: Introductionmentioning

confidence: 99%

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High-efficiency triple-resonant inelastic light scattering in planar optomagnonic cavities

et al. 2019

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Optomagnonic cavities have recently been emerging as promising candidates for implementing coherent photon-magnon interactions, for applications in quantum memories and devices, and next generation quantum networks. A key challenge in the design of such cavities is the attainment of high magnon-mediated optical-to-optical conversion efficiencies, which could, e.g., be exploited for efficient optical interfacing of superconducting qubits, as well as the practicality of the final designs, which ideally should be planar and amenable to on-chip integration. Here, on the basis of a novel time-Floquet scattering-matrix approach, we report on the design and optimization of a planar, multilayer optomagnonic cavity, incorporating a cerium-substituted yttrium iron garnet thin film, magnetized in-plane, and operating in the triple-resonant inelastic light scattering regime. This architecture allows for magnon-mediated optical-to-optical conversion efficiencies of about 5% under realistic conditions, which is orders of magnitude higher than that attained in alternative optomagnonic designs. Our results suggest a viable way forward for realizing practical information inter-conversion, with high efficiencies, between microwaves, strongly coupled to magnons, and optical photons, as well as a platform for fundamental studies of classical and quantum dynamics in magnetic solids and for the implementation of futuristic quantum devices.

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Proposal for a microwave photon to optical photon converter based on traveling magnons in thin magnetic films

Cited by 19 publications

References 31 publications

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Microwave magnon damping in YIG films at millikelvin temperatures

High-efficiency triple-resonant inelastic light scattering in planar optomagnonic cavities

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